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Or you can just visit the Administration front / home page (admin.php).Going to that page triggers kiwitrees to automatically delete no longer required files including eleven redundant research link plugins.

But certain server configurations might not allow kiwitrees to delete file. In that case there will be a message on that page, and a list of files you can remove manually.

The download is only necessary if you made your own plugins, you can upload these again.

That is also true, but you might also need to re-write them as there have been code changes in the plugins. The research links folder now contains a template file you can use as a starter for any new plugins.